Waterproofing Membrane Calculator — m, m², cost
How to use this calculator
Select surface type — foundation wall (perimeter × depth), slab/floor, deck/balcony, or custom area in m². Choose membrane type and get quantities with optional primer, seam tape, and cost breakdown.
Liquid applied — coverage ~1.5 m²/L at 1.5 mm DFT.
Sheet membrane — 1 m wide rolls, 150 mm overlap.
Drain board — 1.2 m × 20 m sheets (24 m²).
Dimple mat — 1.5 m × 20 m rolls (30 m²).
Saved Calculations
| Time | Surface | Area m² | Type | Qty | Cost |
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How to Calculate Waterproofing Membrane (Metric)
This calculator estimates membrane quantity for foundation walls, slabs, decks, and custom areas in metric units. Choose from liquid applied (1.5 m²/L at 1.5 mm DFT), self-adhesive sheet membrane (1 m wide rolls), drain board (1.2 m × 20 m), or dimple mat (1.5 m × 20 m).
Standards
EN 13967 for plastic and rubber sheets for below-grade waterproofing. EN 15814 for polymer-modified bituminous thick coatings. Minimum 1.5 mm DFT for liquid membranes per manufacturer specifications.
FAQ
Primer required? Most systems require primer on concrete substrates. Coverage ~5 m²/L. Drain board vs dimple mat? Drain boards (XPS-based) add insulation value. Dimple mats are lighter and more economical for drainage protection.
